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    <script>
        //let 变量
        //const 常量 不变的量
        //不能重复声明、不能重复赋值
        // const a = 10;
        // console.log(window.a)
        // const obj = {
        //     name: "张三",
        //     age: 20
        // }
        // obj = {
        //     name: "瓦尔基里"
        // }
        // obj.name = "mimimi"
        // console.log(obj);
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